Electric-light bulb



C. H. AND H. E. QUACKENBUSH.

ELECTRIC LIGHT BULB.

APPIICAHON FILED Ame, i921.

1,425,606 Patented Aug. 15, 1922,

27?? I I 5144mm @LEVELAND 'QXMHIK'EZTBUSE .llll'D HARVEY l3.Q'UACKENBUSH, F CLEVI'E- LABEL REE TRI 'FLKGH'E BULB.

Specification of Letters Patent.

Patented Aug. 15, 1%?2.

Application filed April 6, 1921. Serial Ho. 158.9%.

Tu be, of which the following is a specihestion.

This invention relates to electric light bulbs, more particularly tobulbs of the soczlled miniature type which are generally formed from;tubular glass.

in the manufacture of bulbs of this class "tubing is generally used, thetubing irst cut into units of proper length. il ler heads are thenblown, or molded e units, said heads tapering down to .oulur neck, theneck retaining sutlicient to admitof the sealing therein, in properposition, of the filament stern. The bul s as an article of manufactureare thus formed of predetermined uniform dimensions. and the stems areafterward sesle "ein by a separate operation.

heretofore in the manufacture of bulbs ,iu' LT 1 }Q oi ems type, the,llObll ar heat ias seen foried from the tubing unit while theoriginuldiumetricul dimension, and thickness of material of the tube has beenmuinl in the neck. This uniform thickmaterial makes it difficult to formhis seal between the neck and the tilement stein. I

Tue object of the present invention is to provide bulbs of thischaracter that can be iorcexpeditiously and reliably sealed than i thebulls as heretofore manufacture. 3h object is attained by the peculiarformu- -i of the bulb. Which facilitates the rereeling, or attachment ofthe neck: to the stem which carries the light 1, will be hereinafterfully desmibed end definitely pointed out in the claims, reference beingbad to the accompanying drawings which are made part of specificetio-,siruilsr referencecharacters being employed to designate correspondingu nts.

drawings Figure 1 is an elevaion of the improved bulb. Fig. 2 is scenverticul section. Fig. 3 is an illus- 7 rs ion of s filament stemdetached. Fig. 4 illustrates the impgoved bulb, partially in 'ection,showing the filament stein in elevation of esealed bulb.

The present invention provides, as a new article of manufacture, t bulbhaving a globular element 1 formed from the tubing, 6

said globular element tapering down to the throat line 1 Where the fullthiclmess of the material is maintained. The tubular well of the neck isdrawn down from the throat line l to comparative thinness at andfiBslightly below the sealing line l This peculiar formation of the neckprovides thickness of material at the throat Where it is desirable forstrength, while the glass beinc, thinner at the sealing line facilitatesthe reliable sealing of the filament stem 2 in the neck of the bulb, andthe detaching of the sunerfiuous portion 1 of the tube, after the sealis made.

What We claim and desire to secure by '95 Letters Patent is.

1. As a new article of manufacture, an electric light bulb, comprisingan inclosed head, and ii tubular neck, the Wall of said neck being drawndown from a predetermined thickness at the throat line to comparativethinness at the sealing line.

2. As an article of manui'acture, an elecv trio light bulb, comprising aglobular head,

and tubular neck. the Wall of said neck being a predetermined thicknessat the throat and drawn down comparatively thin in proximity to thesealing line. i

3. An electric light bulb having a globular head and a tubular neckWithin which, the filament stem is to be sealed, the Wall of the neckbeing reduced in thickness from the head to the sealing line andincreased in thickness from said sealing line to the lower terminal ofthe neck.

in testimony whereof We afix our signs sures.

fiLEVELAPllE H. WACKENBUSH. HARVEY E. QUACIQENBUSH.

s posi- 55 tion for sealing, and Fig. 5 IS a sectional

